Inclinometer.



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UNITED STATES PATENT -QEEIGE.

ADOLF GOHL, OF WANGEN, GERMANY.

|NQLINOMETER.

SPECIFICATION forming partof` Letters Patent No. 653,446, dated July 10,1900. Application led November 10, 1899. Serial No. 736,529. (No model.)

berg, Germany, have invented certain new and useful Improvements inInclinometers; and

I do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art to io which it appertains to make and use thesame.

The subject of the present invention is a new or improved spirit-levelfor measuring angles, essentially consisting of a transparent glass tubeso bent as to have the form of a I5 quarter of a circle and providedwith a scale of division into degrees. is, like the straight tube of anordinary spiritlevel, partially iilled with sulfuric ether or othersuitable liquid in such manner that a zo portion of the interior spaceis left free in order to hold the air required for forming the bubble.

If a spirit-level having the shape of a quadrant, as described, issecured to a ruler or z5 straight-edge in such mannerthat the tangentsat the ends ofthe quadrant glass tube are the one parallel 'and theother perpendicular to the straight-edge every angle formed by thelatter and a horizontal line or surface can 3o. at once be ascertainedby the air-bubble and the scale of degreesan advantage which will proveof considerable importance, for instance, in laying down pipes Aand thelike. The ruler or straight-edge can also be used for horizontal andYvertical adjustment in builders and similar work. l

Reference is had to the accompanying drawings, in which thereference-letters refer to the same parts in the several views.

4o Figure 1 shows a straight-edge provided with the improvedspirit-level and placed at an incline of thirty degrees to thehorizontal. Figs. 2 and 3 illustrate the spirit-tube respectively inside elevation andfront View.

Fig. 4 shows an lindicator-clip adapted to be pushed over and movedalong the glass tube in side View and also vertical section. Fig. 5shows the spirit-level inserted into the re spective portion of astraightedge on an en- 5o larged scale as compared with Fig. l. Fig. 6

is a vertical cross-section of Fig. 5.

The said bent tube Y 'l v The quadrant-shaped glass tube a is sed curedby means of -its ends, which are slightly continued in straight linesbeyond the quarter of the circle, so as to stand at right angles to eachother, in suitably-prepared beds in the sides of the aperture c', cutout in ruler or straight-edge c, by meansof putty or in other convenientmanner. The lower surface of tube o, is made to rest in acorrespondinglyhollowed-out *support g, the edges of which are beveledin order to facilitate the observation of the scale of degrees on theglass tube. If desired, the scale of degrees may be on the said bevelededges instead of being indicated on the glass tube a. The body ofstraight-edge or ruler c` being weakened by preparing the aperture c forthe reception of the spirit-level, metal plate d may be provided andsecured by screws or the like in order to strengthen the said ruler.

For the purpose of protecting the spiritlevel a from damage when thesame is not required for use there is provided a U-shaped "double shieldf, made of sheet metal or the like and adapted to be inserted and drawnout in longitudinal slots arranged in the body of the ruler orstraight-edge c in such manner that the aperture c/ can thereby beefficiently covered up at both sides of the glass tube a.

The vindicator-clip e is movable upon the glass tube ct and serves toindicate the exact angle of the straight-*edge to the horizont-al if theair-bubble is made to lie between the two arms of the clip.

By aid of the hereinbefore-described instrua ment the degrees of anyangle from zero to ninety degrees can be expeditiously asceltained, orstones, pipes, beams, and the like can be laid down or adjusted in anygiven angle to the horizontal. The improved instrument may also be usedin place of the ordinary straight-tube spirit-level for horizontal orvertical adjustment.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is'-V 1. The combinationin an instrumentof, the characterdescribed, with a straight-'edge and a quadrant-tube containing anindicating bubble and having grad nations on its exposed ide, of anindicating-clip having an orifice and being adapted to slide on thetube'to cause said orifice to register with said bubble, said cliphaving another orifice arranged to expose said graduations, and apointer extending into said latter orifice and arranged to register withsaid graduations. 2. The combination in an instrument of the characterdescribed, with a straight-edge and a quadrant-tube containing anindicatingbubble and having graduations on its exposed side, of anindicating-clip adapted to slide on the tube, said clip comprisinga pairof bands encircling the tube for about two hundred degrees, pairs ofnarrow strips connecting the bands, one pair on each side of its middleportion, and a pointer on one of said bands extending toward the otherband and adapted ADOLF GOHL.

Witnesses:

AUGUST DRAUTZ, HERMANN WAGNER.

